Using variable in RegExp

Asked Feb 05 '20 at 08:42

Active Feb 05 '20 at 12:23

Viewed 32 times

I am attempting to extract Smith from name into lastName.

function reggie(){
  var name = "JohnSmith";
  var first = "John";
  var regExp = new RegExp("(?:"+first+")(w+)", "gi");
  var lastName = regExp.exec(name);
  //Logger.log(lastName); // in google apps
  console.log(lastName);
}
reggie()

edited Feb 05 '20 at 12:23

Jim

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asked Feb 05 '20 at 08:42

Chris Barrett

1

`w` matches `w`, you need `\\w` and then `Logger.log(lastName[1])` (but check if there is a match first) – Wiktor Stribiżew Feb 05 '20 at 08:44
Ah. Indeed it was `\\`. Thanks @Wiktor. Its still not matching but at least getting there – Chris Barrett Feb 05 '20 at 08:47
`var regExp = new RegExp("(?:"+first+")(\\w+)", "gi")` matches your `JohnSmith` string perfectly. Though you do not need the non-capturing group. Use `new RegExp(first+"(\\w+)", "gi")`. Actually, GAS RegExp has trouble with non-capturing groups sometimes. – Wiktor Stribiżew Feb 05 '20 at 08:48
got it. thanks again – Chris Barrett Feb 05 '20 at 08:52

Using variable in RegExp

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